Mattress stitch creates a smooth, nearly invisible seam... perfect for joining crochet motifs when you want the join to disappear into the fabric. Thread a tapestry needle with coordinating yarn and sew from corner to corner as follows:
- Insert the needle from back to front through the corner chain of the left motif.
- Insert the needle from back to front through the corner chain of the right motif.
- Insert the needle from back to front under both loops of the next stitch on the left motif.
- Insert the needle from back to front under both loops of the next stitch on the right motif.
- Repeat steps 3–4 until you reach the next corner.
- Repeat steps 1–2 in the corner.
This method pulls the motifs together neatly without bulk, giving your project a clean, professional finish.

